Question

The energy gap in a semiconductor
A. Increases with temperature
B. Does not change with temperature
C. Decreases with temperature
D. Is zero

Answer 1

Semiconductor is that type of material which has a conductivity between the solids conductors and insulators. It is a topic of Solid State.

Complete answer:
First of all, It is a topic of solid state. So, first I'll tell you about solid state physics.
It is a branch of physics which is devoted to the study of matters, solids. It is the largest branch of condensed matter physics.
So, the term energy gap is the gap between the energy of the conduction band to the valence band, where the electrons are forbidden.
The conduction band is the band which is high in energy but it’s generally empty. It is empty because there is no energy of electrons between the two bands.
In the simple terms, the valence band is the outermost electron orbital of an atom where the electrons occupy.
The term forbidden gap is the energy difference of the top of the conduction band and the bottom of the valence band. This is the small energy of the difference and it can be controlled by thermal agitation.
In microscopic level the term conduction band, valence band and forbidden band it’s decided whether it is conductor, insulator or semiconductor.
In an easy language, the Semiconductor in certain cases allows them to pass the current. When we raise the temperature then its conductivity increases so it allows us to pass the current.
The band gap of semiconductor is decreases with the increasing temperature

So, the option C is correct

Note:
When the temperature is increased the atomic vibrations, amplitude is increased, there is a major inter atomic spacing.